JP6656901B2 - Construction method of segments and submerged structures - Google Patents

Description

  The present invention relates to a segment constituting a submerged structure and a method of constructing the submerged structure.

  In order to construct submerged structures such as shafts and bridge piers underground, multiple segments are connected to form a ring body, and ring bodies are stacked in the axial direction and multiple connected submerged bodies are submerged in the ground. There is a known sinking method.

  When submerging the submerged body in the ground, a cutting ring is provided on the ground surface of the construction site, the ground inside the cutting ring is excavated, and the upper end of the cutting ring is directed toward the ground by the subsidence device. Press and sink the cutting edge ring into the ground. After sinking the cutting ring to a certain depth, another ring body is connected to the upper end of the cutting ring, the inside of the ring body is excavated, and the upper end of the ring body is pressed toward the ground by the sinking device, The ring body is sunk underground. As described above, the submerged body can be submerged in the ground by repeatedly repeating the assembling of the submerged body by connecting the plurality of ring bodies, the excavation of the ground, and the pressing of the submerged body.

  A segment for constructing a ring body including a curved plate serving as a wall of a submerged structure, a main girder provided at an upper end and a lower end of the plate, and a joint provided at a left end and a right end of the plate. Is known. The plate, the main girder, and the joint are all formed in a plate shape (for example, see Patent Document 1).

  In addition, a submerged body in which a press-fit type frame, a reinforcing bar, and a steel structure are arranged as an inner frame and an outer frame are known from inside. Concrete is poured into the space where the reinforcing steel is arranged between the press-fitting formwork and the double frame of the steel structure. Only the steel structure is integrated with the reinforcing bar (for example, see Patent Document 2).

Japanese Patent No. 3967494 Japanese Patent No. 4313871

  In recent years, there is an increasing demand for construction of a submerged structure in a large cross section. When constructing a large cross section, it is necessary to increase the size of the segments constituting the submerged structure in order to secure required cross-sectional performance.

  However, transport equipment such as trucks and trailers have limitations on the size that can be loaded, so it is difficult to simply transport a segment with a conventional structure to the construction site after simply creating the segment. . Also, it is not preferable to create a submerged structure at the construction site from the beginning, because it lowers construction efficiency.

  In view of the above, the present invention has been made in view of the above problems, and provides a segment and a method for constructing a submerged structure capable of coping with construction with a large cross section and suppressing a decrease in construction efficiency. The purpose is to:

  In order to solve the above problems, the present invention is a segment constituting a submerged structure buried underground, wherein an outer piece forming an outer wall of the submerged structure and an inner wall of the submerged structure are formed. It is characterized by comprising an inner piece and a connecting piece connecting the outer piece and the inner piece.

  The outer piece and the inner piece each include a plate forming a wall surface, and a main girder erected at an upper end and a lower end of the plate, and the main girder of the outer piece and the main girder of the inner piece are provided. It is preferable that the main girder is connected to the main girder by the connecting piece.

  It is preferable that the connection piece is connected to the main girder with an interval between the plate and the plate.

  The main girder or the plate is preferably provided with a connecting tool for connecting the connecting pieces.

  Preferably, a groove is formed on the outer surface of at least one main girder.

  It is preferable that the main girder of the outer piece and the main girder of the inner piece are formed integrally.

  It is preferable that a through-hole communicating with a space between the outer piece and the inner piece is formed in the main girder.

  The outer piece and the inner piece each include a plate forming a wall surface and a joint erected at a left end and a right end of the plate, and the joint of the outer piece and the joint of the inner piece, Are preferably connected by the connection piece.

  It is preferable that a connecting piece that connects the joint of the outer piece and the joint of the inner piece partitions a space between the plate of the outer piece and the plate of the inner piece.

  It is preferable that a connection tool for connecting the connection pieces is provided on the joint or the plate.

  It is preferable that a connecting tool for connecting the adjacent plates is provided at a left end portion and a right end portion of the plate.

  In order to solve the above problems, the present invention is a method for constructing a submerged structure by assembling the above-described segments to construct a submerged structure, comprising the steps of: (A) assembling an annular ring by connecting the segments. (B) placing concrete in a space between the outer piece and the inner piece of the ring body assembled in the step (A), and after the step (B), Excavating the inner ground and applying a force from above the ring body to immerse the ring body in the ground (C), and performing the steps (A) to (C) to a predetermined depth. Repeating step (D).

  In order to solve the above problems, the present invention is a method for constructing a submerged structure by assembling the above-described segments to construct a submerged structure, comprising the steps of: (A) assembling an annular ring by connecting the segments. (B) placing concrete in the space between the outer piece and the inner piece of the ring body assembled in the step (A); and (A) after the step (B). A) connecting the segments on the upper end surface of the ring body assembled in step (C) to assemble an annular ring body; and after the step (C), excavating the ground inside the ring body, A step (D) of applying a force from above the ring body assembled in the step (C) to sink the ring body assembled in the step (A) into the ground, and a step of assembling the ring body in the step (C). A step (E) of placing concrete in a space between the outer piece and the inner piece of the ring body, and a step (F) of repeating the steps (A) to (E) to a predetermined depth. And the following.

  In order to solve the above problems, the present invention is a method for constructing a submerged structure by assembling the above-described segments to construct a submerged structure, comprising the steps of: (A) assembling an annular ring by connecting the segments. And (B) connecting the segments on the upper end surface of the ring body assembled in the step (A) to assemble an annular ring body and connecting the ring body assembled in the step (A). After the step (B), a step (C) of placing concrete in a space between the outer piece and the inner piece of the ring body assembled in the step (A); ), The ground inside the ring body is excavated, and a force is applied from above the ring body assembled in the step (B) to remove the ring body assembled in the step (A). Characterized in that it has a step of sinking (D), and the step of repeating the up step (D) from a predetermined depth the step (B) (E), the inside.

  Prior to the step (A), it is preferable to assemble a worktable ring serving as a worktable when assembling the segments.

  It is preferable to apply a force above the outer piece when the ring body is submerged in the ground.

  After laying down the ring body to a predetermined depth, a step of constructing a concrete layer on the bottom inside the ring body, and after constructing the concrete layer, a step of draining groundwater inside the ring body Is preferred.

  It is preferable that the method further includes a step of installing a sinking anchor that takes a reaction force when the ring body is sunk in the ground before the ring body is sunk.

  ADVANTAGE OF THE INVENTION According to this invention, it can respond to construction in a large cross section and can suppress the fall of construction efficiency.

It is the schematic front view which looked at a part of submerged structure submerged in the ground. It is a top view of a double ring. It is a perspective view of the segment which comprises a double ring. FIG. 4 is a plan view of the segment of FIG. 3. FIG. 5 is a sectional view of a segment taken along line VV in FIG. 3. It is a figure showing the method concerning a 1st embodiment which constructs a submerged structure. It is a figure showing the method concerning a 1st embodiment which constructs a submerged structure. It is a figure showing the method concerning a 1st embodiment which constructs a submerged structure. It is a figure showing the method concerning a 1st embodiment which constructs a submerged structure. It is a figure showing the method concerning a 1st embodiment which constructs a submerged structure. It is a figure showing the method concerning a 1st embodiment which constructs a submerged structure. It is a figure showing the method concerning a 2nd embodiment which constructs a submerged structure. It is a figure showing the method concerning a 2nd embodiment which constructs a submerged structure. It is a figure showing the method concerning a 2nd embodiment which constructs a submerged structure. It is a figure showing the method concerning a 3rd embodiment which constructs a submerged structure. It is a figure showing the method concerning a 3rd embodiment which constructs a submerged structure. It is a figure showing the method concerning a 3rd embodiment which constructs a submerged structure. It is a perspective view of the modification of the segment which comprises a double ring. It is a perspective view of another modification of the segment which comprises a double ring.

  A preferred embodiment of the present invention will be described with reference to the drawings. The embodiment described below is one example, and various forms can be taken within the scope of the present invention.

FIG. 1 is a schematic front view in which a part of a submerged structure 100 submerged in the ground is viewed in cross section, and shows an example in which the submerged structure 100 is applied to a shaft. FIG. 2 is a plan view of the double ring 44 constituting the ring body 4. FIG. 3 is a perspective view of the segment 5 constituting the double ring 44. FIG. 4 is a plan view of the segment 5 of the double ring 44. FIG. 5 is a cross-sectional view taken along line VV of the segment 5 shown in FIG.
[Structure of submerged structure]
As shown in FIG. 1, the submerged structure 100 is provided at an excavation start point or an intermediate point of a tunnel T constructed underground by a shield method or the like, and a space S inside the submerged structure 100 is provided by a shield machine. It becomes a transport path and a ventilation port.

As shown in FIG. 1, a submerged structure 100 includes a submerged body 1 submerged in the ground, a bottom part 2 provided at a bottom inside the submerged body 1, and a submerged body 1 that is submerged in the ground. And a squatting anchor 3 used for
<Deposited body>
As shown in FIG. 1, the submerged body 1 is constructed in a cylindrical shape, and is submerged in the ground so that its axis is along the vertical direction. The submerged body 1 is obtained by assembling a plurality of annular ring bodies 4 in a plan view in the axial direction thereof. The ring body 4 constituting the submerged body 1 is configured by vertically stacking a blade ring 41, a guide ring 42, a worktable ring 43, and a double ring 44.

  The cutting edge ring 41 is a ring body provided at the lowermost end of the submerged body 1 and has a cutting edge at its lower end. The cutting ring 41 has a tooth tip (tip) on the outside. A plurality of guide rings 42 are connected to the upper end of the blade ring 41 to guide the sinking of the sinker 1. The worktable ring 43 is connected to the upper end of the guide ring 42. The worktable ring 43 is formed so that the upper end face is larger than the lower end face, and is formed so that the upper end face protrudes inside the worktable ring 43. The upper end surface of the worktable ring 43 is formed to be at least large enough to mount the double ring 44. The double ring 44 is connected to the upper end of the worktable ring 43. Above the worktable ring 43, a double ring 44 is provided over a plurality of stages.

  The guide ring 42 provided between the cutting ring 41 and the worktable ring 43 is formed so that the width of the end face in the axial direction gradually increases from the cutting ring 41 to the worktable ring 43. Is more preferable. That is, it is preferable that the width of the upper end face be closer to the width of the worktable ring 43 as the guide ring 42 becomes higher.

In the vertically adjacent rings 41 and 42, the segments of the upper ring 42 and the segments of the lower ring 41 are arranged in a staggered manner so as to be shifted from each other in the circumferential direction of the rings 41 and 42. This arrangement is the same for the rings 42 and 43, the rings 43 and 44, and the rings 44. The ring body 4 is formed by connecting and assembling segments as shown in FIG. 2 along the wall direction.
<Double ring segment>
As shown in FIG. 2, the double ring 44 of the ring body 4 is formed in an annular shape by connecting a plurality of segments 5. The double ring 44 is formed by connecting, for example, 20 segments 5.
Further, the width of the segment 5 as viewed from the radial direction of the double ring 44 is preferably in the range of 3.0 to 15.0% with respect to the final outer diameter of the submerged structure 100, particularly When it is within the range of 8.0 to 10.0%, it is advantageous in that it counters buoyancy caused by groundwater in the ground when the segment 5 is laid.
The material of the segment 5 is not particularly limited, but is preferably a steel material.

As shown in FIG. 3, the segment 5 of the double ring 44 includes an outer piece 51 forming an outer wall of the submerged structure 100, an inner piece 52 forming an inner wall of the submerged structure 100, and an outer piece 51 and an inner piece. And a connecting piece 53 connecting the connecting piece 52 and the connecting piece 52.
The height of the outer piece 51 and the inner piece 52 as viewed from the thickness direction of the segment 5 is preferably in the range of 0.5 to 2.5 m, and in particular, Article 552, Paragraph 1, Item 4 of the Industrial Safety and Health Regulations Based on the provisions of item (a), the distance should be 0.85 m or more. More specifically, it is preferable to set the height of the outer and inner pieces 51 and 52 to 0.9 to 1.5 m, particularly 1.25 m, from the viewpoint of workability.
Further, the distance between the outer piece 51 and the inner piece 52 is preferably 0.4 m or more based on the provisions of Articles 570 and 571 of the Industrial Safety and Health Regulations. Specifically, it is necessary to set the interval between the outer and inner pieces 51 and 52 within the range of 0.4 to 2.5 m, more specifically, within the range of 1.0 to 2.0 m. It is more preferable from the viewpoint of sex.

(Outer piece)
The outer piece 51 includes a rectangular plate 61 formed in an arc shape and forming an outer wall surface of the double ring 44, two main girders 62 erected on the outer edge along the curve of the plate 61, and two Two joints 63 erected at both ends in the longitudinal direction of the main girder 62 so as to connect both ends of the main girder 62, and an inner surface side of the plate 61 parallel to the joint 63 so as to connect the two main girderes 62. , A connecting tool 65 provided on the plate 61, and a connecting tool 66 provided on the main girder 62.

  As shown in FIG. 1, the outer piece 51 is installed above the cutting edge ring 41. Specifically, the outer peripheral surfaces of the cutting edge ring 41 and the outer piece 51 are on the same diameter as the submerged body 1.

  The main girder 62, one of the joints 63, and the rib 64 may be joined to the plate 61 by welding, or may be partially formed integrally with the plate 61. Further, the other joint 63 may be joined to the main girder 62 by welding, or a part thereof may be formed integrally with the main girder 62.

  As shown in FIG. 4, the plate 61 forms an outer wall surface of the double ring 44.

  As shown in FIG. 5, the plate 61 is joined to an end face of the main girder 62 so as to connect between the two main girder 62 and radially outside the double ring 44.

Returning to FIG. 3, connecting members 65 are provided at both ends in the circumferential direction of the plate 61 along the axial direction of the segment 5. One end of the coupling tool 65 is joined to the plate 61 by welding or the like, and the other end is formed in a hook shape. The hook-shaped other end protrudes in the circumferential direction from the main surface of the joint 63. The connection between the segments 5 is performed by engaging the tip of the connecting tool 65 provided on the plate 61 of the adjacent segment 5 with each other. That is, the segment 5 is connected to the circumferentially adjacent segment 5 by connecting the connecting tool 65 at the hook-shaped other end to the hook-shaped other end of the connecting tool 65 of the circumferentially adjacent segment 5. Can be.
The tensile strength of the connecting member 65 is preferably equal to or greater than the tensile strength of the plate 61.

  The connecting member 65 may be joined to the plate 61 by welding as a separate member, or may be formed integrally with the plate 61.

  As shown in FIGS. 3 and 5, the main girders 62 are erected on the upper end and the lower end of the plate 61. Each main girder 62 is formed with a plurality of through holes 62a through which bolts are inserted at predetermined intervals along the longitudinal (extending) direction. Here, the through holes 62a of the two main girders 62 are formed such that the through holes 62a penetrate each other along the same axis parallel to the axis of the double ring 44, and the double rings 44 are vertically stacked. In this case, the through holes 62a of the main girders 62 are formed so as to face each other. When the double rings 44 are connected to each other, the main girders 62 of the vertically adjacent double rings 44 are abutted with each other, bolts are inserted into both through holes 62a, and tightened with nuts. 44 can be connected to each other to construct the sinking body 1.

  On each outer surface of the two main girders 62 erected at the upper end of the plate 61, a groove 62b is formed along the longitudinal direction of the main girders 62. An elastically deformable material such as rubber is provided in the groove 62b in order to seal a gap between the double rings 44 stacked vertically. When the adjacent segments 5 are connected to form the double ring 44, the grooves 62b may communicate with each other to form an annular groove, or may be completed in each segment 5. The groove 62b may be formed only on the outer surface of the one main girder 62.

  As shown in FIGS. 3 and 4, a notch 67 is formed at one end of the main girder 62. Specifically, the notch 67 is formed at one end of the main girder 62 on the radially outer side of the double ring 44. The notch 67 has an arc-shaped wall 68, which connects the two main girders 62 in the axial direction of the double ring 44. The wall portion 68 has one end connected to the connecting member 65 and the other end connected to the joint 63 in the width direction (transverse direction), and is preferably joined by welding.

  When the segment 5 is connected to the adjacent segment 5, the notch 67 provides a space for connecting the connecting tools 65 to each other.

  As shown in FIG. 3, the joint 63 is erected between both ends of the two main girders 62 at both ends of the main girders 62 and one of the left and right ends of the plate 61.

  As shown in FIGS. 3 and 4, the ribs 64 are erected on the inner peripheral surface of the plate 61 in parallel with the joint 63 at predetermined intervals along the bending direction (longitudinal direction) of the plate 61. ing. Specifically, the two ribs 64 form a pair and are provided at equal intervals in the circumferential direction from the center axis of each through hole 62a of the main girder 62. Further, the rib 64 may be joined by welding to the back surface of the main girder 62 where the groove 62b is not formed.

  The rib 64 shown in FIG. 3 is a deformed member having a T-shaped cross section, but the cross-sectional shape is not limited as long as the reinforcing function of the segment 5 is satisfied.

  As shown in FIGS. 3 and 4, a plurality of connecting tools 66 are provided side by side along the longitudinal direction of the main girder 62 (the direction along the edge curved in an arc shape). As shown in FIG. 5, the connecting tool 66 is provided so as to connect the upper and lower main girders 62, and is fixed between one end of the main girder 62 in the longitudinal direction and both ends of the main girder 62. A plurality is provided for each interval. Here, the connecting piece 53 of the adjacent segment 5 is provided at the other end of the main girder 62 in the longitudinal direction (on the side where the notch 67 is provided), so the connecting tool 66 is not provided.

The connecting tool 66 has one end joined to the main girder 62 by welding or the like, the other end formed in a hook shape, and provided so as to protrude from the inner edge of the main girder 62. The connecting tool 66 is connected to the connecting piece 53, and the outer piece 51 and the inner piece 52 can be connected by engaging one end of the connecting tool 66 with one end of the connecting piece 53.
Further, the connecting tool 66 may be connected to the joint 63.
In addition, although the number of the coupling tools 66 is three in the illustrated embodiment, it is not particularly limited.

(Inside piece)
The inner piece 52 includes a rectangular plate 71 formed in an arc shape and forming an inner wall surface of the double ring 44, two main girders 72 erected on an outer edge along the curve of the plate 71, and two Two joints 73 erected at both ends in the longitudinal direction of the main girder 72 so as to connect between both ends of the main girder 72, and an inner surface side of the plate 71 parallel to the joint 73 so as to connect between the two main girder 72. , A connector 75 provided on the plate 71, and a connector 76 provided on the main girder 72.

  The main girder 72, one joint 73, and rib 74 may be joined to the plate 71 by welding, or may be partly formed integrally with the plate 71. Further, the other joint 73 may be joined to the main girder 72 by welding, or a part thereof may be formed integrally with the main girder 72.

  As shown in FIG. 4, the plate 71 forms the inner wall surface of the double ring 44.

  As shown in FIG. 5, the plate 71 is joined to the end face of the main girder 72 so as to connect between the two main girder 72 and radially inside the double ring 44.

Returning to FIG. 3, connecting members 75 are provided at both ends in the circumferential direction of the plate 71 along the axial direction of the segment 5. One end of the connector 75 is joined to the plate 71 by welding or the like, and the other end is formed in a hook shape. The hook-shaped other end protrudes in the circumferential direction from the main surface of the joint 73. The connection between the segments 5 is performed by meshing a connector 75 provided on the plate 71 of the adjacent segment 5 with the distal end. That is, the segment 5 is connected to the circumferentially adjacent segment 5 by connecting the connecting tool 75 at the hook-shaped other end to the hook-shaped other end of the connecting tool 75 of the circumferentially adjacent segment 5. Can be.
The tensile strength of the connecting member 75 is preferably equal to or greater than the tensile strength of the plate 71.
When the segments 5 are connected to form the double ring 44, the total resistance moment of the coupling members 65 and 75 provided in the double ring 44 corresponds to 30 to 70% of the total resistance moment of the double ring 44. Is preferred.

  The connecting member 75 may be joined to the plate 71 by welding as a separate member, or may be formed integrally with the plate 71.

  As shown in FIGS. 3 and 5, the main girders 72 are erected at the upper end and the lower end of the plate 71. Each main girder 72 has a plurality of through holes 72a through which bolts are inserted at predetermined intervals along the extending (longitudinal) direction. Here, the through holes 72a of both main girders 72 are formed such that the through holes 72a penetrate each other along the same axis parallel to the axis of the double ring 44, and the double rings 44 are vertically stacked. In this case, the through holes 72a of the main girders 72 are formed so as to face each other. When the double rings 44 are connected to each other, the main girders 72 of the vertically adjacent double rings 44 are abutted with each other, bolts are inserted into both through holes 72a, and tightened with nuts. 44 can be connected to each other to construct the sinking body 1.

  On each outer surface of the two main girders 72 erected on the upper end of the plate 71, a groove 72b is formed along the longitudinal direction of the main girders 72. An elastically deformable material such as rubber is provided in the groove 72b in order to seal a gap between the double rings 44 stacked vertically. When the adjacent segments 5 are connected to form the double ring 44, the grooves 72b may communicate with each other to form an annular groove, or may be completed in each segment 5. The groove 72b may be formed only on the outer surface of one main girder 72.

  As shown in FIGS. 3 and 4, a notch 77 is formed at one end of the main girder 72. Specifically, the notch 77 is formed at one end of the main girder 72 on the radially inner side of the double ring 44. The notch 77 has an arc-shaped wall 78, which connects the two main girders 72 in the axial direction of the double ring 44. The wall 78 has one end connected to the connector 75 and the other end connected to the joint 73 in the width direction (transverse direction), and is preferably joined by welding.

  When the segment 5 is connected to the adjacent segment 5, the notch 77 provides a space for connecting the connecting tools 75.

  As shown in FIG. 3, the joints 73 are erected at both ends of the main girder 72 and at both left and right ends of the plate 71 between both ends of the two main girders 72.

  As shown in FIG. 4, the ribs 74 are provided upright on the inner peripheral surface of the plate 71 in parallel with the joint 73 at predetermined intervals along the bending direction (longitudinal direction) of the plate 71. Specifically, the two ribs 74 form a pair and are provided at equal intervals in the circumferential direction from the center axis of each through hole 72 a of the main girder 72. The rib 74 may be welded to the back side of the main girder 72 where the groove 72b is not formed.

  The rib 74 shown in FIG. 3 is a deformed member having a T-shaped cross section, but the cross-sectional shape is not limited as long as the reinforcing function of the segment 5 is satisfied.

  As shown in FIGS. 3 and 4, a plurality of connecting tools 76 are provided side by side along the longitudinal direction of the main girder 72 (the direction along the edge curved in an arc shape). As shown in FIG. 5, the connecting member 76 is provided so as to connect the upper and lower main girders 72, and is fixed between one end of the main girder 72 in the longitudinal direction and both ends of the main girder 72. A plurality is provided for each interval. Here, the connecting piece 53 of the adjacent segment 5 is provided at the other end of the main girder 72 in the longitudinal direction (on the side where the notch 77 is provided), and therefore the connecting tool 76 is not provided.

The connecting member 76 has one end joined to the main girder 72 by welding or the like, the other end formed in a hook shape, and provided so as to protrude from the inner edge of the main girder 72. The connecting tool 76 connects the connecting pieces 53, and the outer piece 51 and the inner piece 52 can be connected by engaging one end of the connecting tool 76 with one end of the connecting piece 53.
Further, the connecting tool 76 may be connected to the joint 73.
In addition, although the number of the coupling tools 66 is three in the illustrated embodiment, it is not particularly limited.

(Connection piece)
As shown in FIG. 4, the connecting piece 53 is connected to the main girders 62 and 72 with an interval between the plate 61 of the outer piece 51 and the plate 71 of the inner piece 52. Specifically, the connecting piece 53 is provided between the connecting tool 66 of the main girder 62 and the connecting tool 76 of the main girder 72 that face each other. The joint 63 of the outer piece 51 and the joint 73 of the inner piece 52 are connected by a connecting piece 53.

The connecting piece 53 is formed in a plate shape, for example, like a straight steel sheet pile, and has hook-shaped connecting tools 53a at both ends. The connecting piece 53 can connect the outer piece 51 and the inner piece 52 by engaging the connecting tool 53a with the hook-shaped ends of the connecting tools 66 and 76.
The tensile strength of the connecting piece 53 is preferably equal to or greater than the tensile strength of the plates 61 and 71. When the segments 5 are connected to form the double ring 44, the resistance moment of the entire connection piece 53 provided in the double ring 44 may correspond to about 40% of the resistance moment of the entire double ring 44. preferable.

Since there is a gap between the connecting piece 53 and the plates 61, 71, more specifically, between the connecting tools 66, 76, after connecting the segments 5 to assemble the double ring 44, When the concrete C is poured into 44, the concrete C can be filled in the segment 5 through the gap between the connecting piece 53 and the plates 61 and 71. Accordingly, the concrete C can be filled in the entire area of the segment 5 only by pouring the concrete C from one place, and the work load of the concrete C can be greatly reduced.
Preferably, the connecting tool 53a is formed integrally with the connecting piece 53.

  Further, in order to make the adjacent segments independent after the concrete is cast, the connecting piece 53 connected to the joints 63 and 73 needs to be formed so as to completely close the space between the joint 63 and the joint 73.

<Bottom panel>
As shown in FIG. 1, the base 2 serves as a foundation of the submerged structure 100 and also prevents underground water from flowing into the submerged body 1.

  The bottom part 2 is constructed by underwater concrete, for example. The bottom part 2 is constructed such that its upper surface is substantially along a horizontal plane.

<Sinking anchor>
The sinking anchor 3 takes a reaction force on the ground when applying a force to the ring body 4 from above the uppermost ring body 4 and pushing the ring body 4 into the ground in the step of sinking the sinking body 1 in the ground. is there. As shown in FIG. 1, the sinking anchor 3 is embedded and fixed in the ground excavated outside and below the sinking position of the sinking body 1, and is connected to the anchoring portion 31, and is connected to the outside of the sinking body 1. It has a connecting portion 32 that extends along the wall surface to the surface of the ground and is connected to an immovable portion (a base portion or the like) of a sinking device 90 (see FIG. 8) for pushing the ring body 4.

  The fixing unit 31 is formed by, for example, grout poured into the excavated ground. The fixing portion 31 is constructed at a position deeper than the cutting edge ring 41 outside the cutting edge ring 41 at the lowermost end of the submerged body 1.

The connecting portion 32 is formed of, for example, a steel wire (wire rope). The lower end of the connecting portion 32 is embedded and fixed in the fixing portion 31 by solidifying the grout, and the upper end is connected and fixed to an immovable portion of the submerging device 90.
The fixing portion 31 and the connecting portion 32 are formed to extend on the same axis in a direction perpendicular to the ground surface.

<Construction method of submerged structure>
(First construction method)
Next, a first method for constructing the submerged structure 100 by submerging the submerged body 1 in the ground will be described with reference to FIGS. Hereinafter, for convenience of explanation, a plurality of steps will be described in the same drawing.

  The construction method of the submerged structure 100 described below is a method useful for construction of a large cross section and a large depth.

  First, a plurality of excavation holes are formed using a rotary percussion (not shown) outside the construction site where the submerged body 1 is to be constructed. Excavation holes are formed in a ring shape at predetermined intervals along the outer wall of the submerged body 1 to be submerged. The excavation hole is formed to a position deeper than the lower end of the submerged body 1 along a direction perpendicular to the ground surface. Grout is injected into each of the formed drill holes, and the connecting portion (wire rope) 32 is inserted into the drill hole. At this time, the lower end of the connecting portion 32 is immersed in the grout. By the solidification of the grout, the fixing part 31 and the connecting part 32 fixed to the fixing part 31 are constructed, and the installation of the sinking anchor 3 is completed.

  Next, the sinking device 90 is installed at a construction site where the sinking body 1 is to be constructed, and the upper end of the connecting portion 32 is connected to an immovable portion (eg, a leg) of the sinking device 90. The submerging device 90 is configured by, for example, a hydraulic jack or the like, and can press the uppermost ring body 4 toward the ground to submerge the ring body 4 into the ground.

  Below the submerging device 90, a cutting edge ring 41 arranged at the lowermost end of the submerged body 1 is installed. The ground inside the installed cutting edge ring 41 is excavated by a clam shell 92 attached to the tip of a crawler crane 91, and when excavation of a depth necessary for submerging the cutting edge ring 41 into the ground is completed, excavation is performed. Then, the upper surface of the cutting ring 41 is pressed toward the ground by the setting device 90, and the cutting ring 41 is set in the ground. After the cutting edge ring 41 is disposed, the guide ring 42 is overlapped and connected to the upper side of the cutting edge ring 41 in the axial direction. After the connection of the guide ring 42, the ground inside the guide ring 42 is excavated by the clam shell 92, and when excavation of the depth required for submerging the guide ring 42 into the ground is completed, the excavation is stopped and the submerging device 90 is used. The upper surface of the guide ring 42 is pressed toward the ground, and the guide ring 42 is sunk in the ground. After the connection and the sunk of the guide ring 42 are repeated a predetermined number of times, the work table ring 43 is overlapped and connected to the upper side of the guide ring 42 in the axial direction (FIG. 6A). After the connection of the worktable ring 43, the ground inside the guide ring 42 is excavated by the clamshell 92. When excavation of a depth required for submerging the worktable ring 43 into the ground is completed, the excavation is stopped, and With 90, the upper surface of the worktable ring 43 is pressed toward the ground, and the worktable ring 43 is sunk in the ground (FIG. 6B).

  The above is a preceding process for convenience of explanation.

  Next, in a first step shown in FIG. 7A, the ring 5 is assembled by connecting the segments 5. Specifically, the segments 5 are connected at the upper end surface projecting inside the worktable ring 43 to form an annular double ring 44. After the formation of the double ring 44, concrete C is poured into the double ring 44 in a second step shown in FIG. Specifically, concrete C is cast in the space between the plate 61 of the outer piece 51 and the plate 71 of the inner piece 52.

  In the third step shown in FIG. 8A, the ground inside the double ring 44 in the first step is excavated by the clam shell 92 after the concrete C is poured. When the excavation of the depth required for submerging the double ring 44 into the ground is completed, the excavation is stopped, and the upper surface of the double ring 44 is pressed toward the ground by the submerging device 90, so that the double ring 44 is grounded. Sinking inside. Specifically, the upper part of the outer piece 51 of the segment 5 constituting the double ring 44 is pressed to sink the double ring 44 in the ground. After the double ring 44 is laid down, in a fourth step shown in FIG. 8B, another double ring 44 is formed by connecting the segments 5 on the upper side in the axial direction of the double ring 44 in the first step.

  After the formation of the double ring 44 in the fourth step, in the fifth step shown in FIG. 9A, concrete C is poured into the double ring 44 connected in the fourth step. Next, in a sixth step shown in FIG. 9B, the ground inside the double ring 44 in the fourth step is excavated by the clamshell 92, and the ground necessary for the submersion of the double ring 44 in the fourth step is required. When the excavation of the depth is completed, the excavation is stopped, and the upper surface of the double ring 44 in the fourth step is pressed toward the ground by the sinking device 90 to sink the double ring 44 in the fourth step.

  In the seventh step shown in FIGS. 10A and 10B, the above first to sixth steps are repeated to a predetermined depth. As a result, all the ring bodies 4 necessary for constructing the submerged body 1 are connected and submerged, and the subsidence of the submerged body 1 is completed as shown in FIG.

  In addition, when the cutting edge ring 41 and the ring body 4 are sunk, a force to lift the sunk device 90 by receiving a reaction force from the ground acts. The sunk anchor 3 is connected to the sunk device 90. So it doesn't float. In addition, when the submerging device 90 is removed after the submerged body 1 is submerged, the upper end of the connecting portion 32 is connected and fixed to a structure or ground near the ground surface.

  As shown in FIG. 11, after the subsidence of the submerged body 1 is completed, underwater concrete is poured into the bottom of the submerged body 1 to construct the bottom part 2. From the viewpoint of reinforcement at the lower part (the cutting edge ring 41, the guide ring 42, the working table ring 43) of the immersion body 1, the upper surface of the base 2 is preferably at least above the working table ring 43.

As shown in FIG. 11A, immediately after the submerged body 1 is submerged, the groundwater W is filled inside the submerged body 1. Therefore, in the eighth step shown in FIG. A submersible pump (not shown) is installed in the groundwater W inside the body 1 to discharge the groundwater W to the outside of the submerged body 1.
The submerged structure 100 is constructed by the above first to eighth steps.

(Second construction method)
Next, a second method of constructing the submerged structure 100 by submerging the submerged body 1 in the ground will be described with reference to FIGS. Hereinafter, for convenience of explanation, a plurality of steps will be described in the same drawing. Note that, also in the second method, the pre-process shown in FIG. 6 is the same as that of the first method, and thus description thereof will be omitted, and different points will be mainly described.

  After the pre-process shown in FIG. 6, in a first process shown in FIG. 12A, the segments 5 are connected to assemble the annular ring body 4. Specifically, the segments 5 are connected at the upper end surface projecting inside the worktable ring 43 to form an annular double ring 44. After the formation of the double ring 44, in a second step shown in FIG. 12B, concrete C is poured into the double ring 44 in the first step. Specifically, concrete C is cast in the space between the plate 61 of the outer piece 51 and the plate 71 of the inner piece 52.

  In the third step shown in FIG. 13A, after placing the concrete C in the second step, the segments 5 are connected on the axially upper side of the double ring 44 in the first step to form another double ring 44. Form. After the connection, in the fourth step shown in FIG. 13B, the ground inside the double ring 44 in the first step is excavated with the clamshell 92, and the depth required for submerging the double ring 44 in the first step. When the excavation is completed, the excavation is stopped, and the upper part of the outer piece 51 of the double ring 44 in the third step is pressed by the sinking device 90 to sink the double ring 44 in the first step.

After the double ring 44 is laid down in the first step, concrete C is poured into the double ring 44 in the fourth step in a fifth step shown in FIG. In the sixth step shown in FIG. 14B, the above first to fifth steps are repeated to a predetermined depth. As a result, all the ring bodies 4 necessary for constructing the submerged body 1 are connected and submerged, and the subsidence of the submerged body 1 is completed.
The sixth and subsequent steps are the same as the eighth step of the first method.

(Third construction method)
Next, a third method of constructing the submerged structure 100 by submerging the submerged body 1 in the ground will be described with reference to FIGS. Hereinafter, for convenience of explanation, a plurality of steps will be described in the same drawing. Note that, also in the third method, the pre-process shown in FIG. 6 is the same as that of the first method, and thus description thereof will be omitted, and different points will be mainly described.

  After the pre-process shown in FIG. 6, in a first process shown in FIG. 15A, the segments 5 are connected to assemble the annular ring body 4. Specifically, the segments 5 are connected at the upper end surface projecting inside the worktable ring 43 to form an annular double ring 44. After the formation of the double ring 44, in a second step shown in FIG. 16 (b), another double ring 44 is formed by connecting the segments 5 on the axially upper side of the double ring 44 in the first step.

  After forming another double ring 44, concrete C is poured into the double ring 44 in the first step in a third step shown in FIG. Specifically, concrete C is cast in the space between the plate 61 of the outer piece 51 and the plate 71 of the inner piece 52. After the concrete C is cast, in the fourth step shown in FIG. 16 (b), the ground inside the double ring 44 in the first step is excavated with the clamshell 92, and the ground is settled in the first step. When the excavation to the required depth is completed, the excavation is stopped, and the upper part of the outer piece 51 of the double ring 44 in the second step is pressed by the sinking device 90 to sink the double ring 44 in the first step.

In the fifth step shown in FIGS. 17A and 17B, the above second to fourth steps are repeated to a predetermined depth. As a result, all the ring bodies 4 necessary for constructing the submerged body 1 are connected and submerged, and the subsidence of the submerged body 1 is completed.
The fifth and subsequent steps are the same as the eighth step of the first method.

<Action and effect>
According to the segment 5 constituting the submerged structure 100 buried in the ground as described above, the outer piece 51 forming the outer wall of the submerged structure 100 and the inner piece 52 forming the inner wall of the submerged structure 100 And the connecting piece 53 for connecting the outer piece 51 and the inner piece 52, so that even in the case of construction with a large cross section, the outer piece 51 and the inner piece 52 are separately formed and transferred to the construction site. It can be used as a large segment 5 by being connected by a connecting piece 53 at a construction site. Thereby, it is possible to cope with construction with a large cross section, and it is possible to suppress a decrease in construction efficiency. In addition, the connecting piece 53 can be used as a shear reinforcing material for the segment 5 and can prevent displacement and inclination between the outer piece 51 and the inner piece 52.
Further, the height of the outer piece 51 and the inner piece 52 as viewed from the thickness direction of the segment 5 is in the range of 0.5 to 2.5 m, and the interval between the two pieces 51 and 52 is 0.4 to 2.5 m. When the distance is within the range of 2.5 m, the assembling work in the segment 5 is facilitated, and an erroneous fall of the worker from the inside of the segment 5 to the outside of the segment 5 can be reliably prevented.
By setting the heights of the outer and inner pieces 51 and 52 in such a range, when assembling the segment 5, the scaffold for the assembling work is provided inside the double ring 44 (the space S of the later submerged structure 100). On the other side). That is, the segment 5 itself can be used as a working scaffold.

  Each of the outer piece 51 and the inner piece 52 includes plates 61 and 71 forming wall surfaces, and main girders 62 and 72 erected at upper and lower ends of the plates 61 and 71, respectively. The main girder 62 of the inner piece 52 and the main girder 72 of the inner piece 52 are connected by the connecting piece 53, so that the mounting stability of the segments overlapping in the axial direction is improved.

  Also, since the connecting piece 53 is connected to the main girders 62 and 72 with an interval between the plates 61 and 71, after the double ring 44 is assembled, the concrete C passes through the above-mentioned interval and passes through the plate. Since it is cast between 61 and 71, the concrete casting work becomes easy.

  In addition, since the joints 63 and 73 or the plates 61 and 71 are provided with the connecting tools 66 and 76 for connecting the connecting pieces 53, the connecting pieces 53 can be easily installed, and the labor for constructing the segment 5 can be reduced. Is reduced.

  In addition, since the longitudinal ends of the plates 61 and 71 are completely separated from the adjacent segments 5 by the joints 63 and 73 and the plate-shaped connecting piece 53, they are adjacent in the circumferential direction even after the concrete is cast. Since the segments 5 are not integrally formed by the solidified concrete, the seismic isolation performance of the submerged structure 100 can be improved.

  In addition, since concrete is poured into each of the ring bodies stacked vertically in the submerged structure 100, even after the concrete is poured, the vertically adjacent segments 5 can be integrally formed by solidified concrete. Since there is no such structure, the seismic isolation performance of the submerged structure 100 can be improved.

  Further, since grooves are formed on the outer surface of at least one main girder, it is easy to install a sealing material for maintaining the sealing property, and the segments 5 overlapping in the vertical direction, that is, the two in the axial direction, The provision of the submerged body 1 having excellent sealing properties between the heavy rings 44 can be provided.

  In addition, since the main girder 62 of the outer piece 51 and the main girder 72 of the inner piece 52 are integrally formed, the shear strength can be further improved, and the mounting stability of the segments overlapping in the axial direction is further improved. improves.

  In addition, since the main girder 62 is formed with a through hole communicating with the space between the outer piece 51 and the inner piece 52, the work of placing the concrete C is facilitated.

  Each of the outer piece 51 and the inner piece 52 includes plates 61 and 71 forming a wall surface, and joints 63 and 73 erected at the left and right ends of the plates 61 and 71, respectively. Since the joint 63 and the joint 73 of the inner piece 52 are connected by the connecting piece 53, the shear strength can be further improved.

  Further, since the joints 63 and 73 or the plates 61 and 71 are provided with the connecting tools 66 and 76 for connecting the connecting pieces 53, the connecting pieces 53 for improving the shear strength are connected to the outer pieces 51 and the inner pieces. 52 can be easily connected.

  The left and right ends of the plates 61 and 71 are provided with connecting members 65 and 75 for connecting the adjacent plates 61 and 71, so that the adjacent segments 5 are connected to each other to form the double ring 44. The overall strength can be improved.

  According to at least one of the methods for constructing the submerged structure 100, the assembling efficiency of the submerged structure 100 having greatly improved seismic performance is improved. In addition, by disposing the concrete C after placing it, it is possible to suppress the displacement of the segments during the placement.

  Further, before the step (A), the work table ring 43 serving as a work table when assembling the segment 5 is assembled, so that the double ring 44 can be easily assembled.

  Further, when the ring body 4 is submerged in the ground, a force is applied above the outer piece 51, so that the pressing force for submerging the ring body 4 is efficiently applied to the blade ring 41 via the outer piece 51. Can communicate well.

  Before the ring body 4 is submerged, the step of installing the submersion anchor 3 that takes a reaction force when the ring body 4 is submerged is provided, so that the submerging device 90 is prevented from floating when the submerged body 1 is submerged. be able to.

<Modified example of double ring segment>
Next, a modified example of the segments constituting the double ring 44 will be described.
(Modification 1)
FIG. 18 is a plan view showing a first modified example of the segment of the double ring 44.

Regarding the segment 5A shown in FIG. 18, the same components as those of the segment 5 are denoted by the same reference numerals, and description thereof will be omitted. The following mainly describes different points.
Note that the same numerical range as that of the segment 5 can be used for the same and similar components of the segment 5A as the above-described segment 5.

  As shown in FIG. 18, the segment 5A of the double ring 44 includes an outer piece 51A forming the outer wall of the submerged structure 100, an inner piece 52A forming the inner wall of the submerged structure 100, and the outer piece 51A and the inner piece 52A. And a connecting piece 53A for connecting

  The outer piece 51A includes a rectangular plate 61A that is formed in an arc shape and forms the outer wall surface of the double ring 44, two main girders 62A that are erected on the outer edge along the curve of the plate 61A, and two A joint 63A erected at one end in the longitudinal direction of the main girder 62A so as to connect both ends of the main girder 62A and an inner surface of the plate 61A parallel to the joint 63A so as to connect the two main girder 62A. 66A provided. The main girder 62A, the joint 63A, and the connecting tool 66A may all be joined to the plate 61A by welding, or may be partially formed integrally with the plate 61A.

  The joint 63A is formed in a plate shape, for example, like a straight steel sheet pile, and stands upright at both ends in the longitudinal direction of the main girder 62A. The joint 63A is different from the joint 63 of the segment 5, and extends between the plates 61A and 71A as an integral joint 63A. Fasteners 80A, 81A are provided at both ends in the radial direction of the double ring 44 of the joint 63A at predetermined intervals in the axial direction of the double ring 44 to enable connection with the adjacent segment 5A. Have a plurality of through-holes (not shown). That is, the segments 5A are connected to each other by the fasteners 80A and 81A via the joint 63A and the joint 63A of the adjacent segment 5A.

  A plurality of connecting tools 66A are provided upright on the inner peripheral surface of the plate 61A. The connecting tools 66A are provided in parallel with each other. The connecting tool 66A has a plurality of through holes (not shown) at predetermined intervals in the axial direction of the double ring 44 for a fastener 80A for connecting to a connecting piece 53A described later. That is, the connecting tool 66A has a connecting mechanism with the connecting piece 53A in addition to the reinforcing function of the segment 5A.

  The inner piece 52A includes a plate 71A, two main beams 72A, a joint 63A shared with the outer piece 51A, and a connector 76A. The plate 71A, the main girder 72A, the joint 63A, and the connecting member 76A of the inner piece 52A have the same configuration as the corresponding components of the outer piece 51A, and therefore description thereof is omitted.

  The connecting piece 53A is provided with a space between the plate 61A of the outer piece 51A and the plate 71A of the inner piece 52A between both ends of the segment 5A in the bending direction. The connection piece 53A has a plurality of through holes (not shown) at predetermined intervals in the axial direction of the double ring 44. The connecting piece 53A and the connecting tools 66A and 76A are connected via fasteners 80A and 81A having bolts and nuts. More specifically, the connection piece 53A is provided between the plates 61A and 71A so that the through-holes thereof are aligned with the through-holes of the connection tools 66A and 76A. Are connected to the connecting tools 66A and 76A through the connecting member.

  When the double ring 44 is assembled by connecting the adjacent segments 5A to each other, four completely separated spaces are formed between the outer piece 51A and the inner piece 52A by the connecting piece 53A and the joint 63A. ing. After assembling the double ring 44 by connecting the segments 5A, when concrete is poured into the double ring 44, concrete is poured into each space.

(Modification 2)
FIG. 19 is a plan view of a second modification of the segment of the double ring 44.
In the segment 5B shown in FIG. 19, the same components as those of the segment 5 are denoted by the same reference numerals, and description thereof will be omitted. The following mainly describes different points.
Note that the same numerical range as that of the segment 5 can be used for the same and similar components of the segment 5B as the above-described segment 5.

  The segment 5B of the double ring 44 includes an outer piece 51B forming the outer wall of the submerged structure 100, an inner piece 52B forming the inner wall of the submerged structure 100, and a connecting piece 53B connecting the outer piece 51B and the inner piece 52B. , Is provided.

  The outer piece 51B has a rectangular plate 61B that is formed in an arc shape and forms the outer wall surface of the double ring 44, a main girder 62B shared with the inner piece 52B, and an erect end on one end in the longitudinal direction of the main girder 62B. And a joint 63B shared with the inner piece 52B. In addition, both the main girder 62B and the joint 63B may be joined to the plate 61B by welding, or a part thereof may be formed integrally with the plate 61B.

  The inner piece 52B includes a rectangular plate 71B that is formed in an arc shape and forms the inner wall surface of the double ring 44, a main girder 62B, and a joint 63B.

  The main girder 62B in the segment 5B is different from the main girders 62 and 72 in the segment 5 and the main girder 62A and 72A in the segment 5A, and is provided upright on the outer edge of the plate 61B and the plate 71B as an integral main girder 62B. That is, in the segment 51B, the main girder 62B bridges between the plates 61B and 71B to connect the outer piece 51B and the inner piece 52B. A plurality of through holes H are formed in the main girder 62B at predetermined intervals along the longitudinal direction.

  The joint 63B in the segment 5B is formed in a plate shape, for example, like a straight steel sheet pile, and stands upright at one end in the longitudinal direction of the main girder 62B. The joint 63B of the adjacent segment 5B is provided at the other end of the main girder 62B, so the joint 63B is not provided. Unlike the joint 63 of the segment 5 and the joints 63A and 73A of the segment 5A, the joint 63B extends as one joint 63B between the plates 61B and 71B at one end of the segment 5B. Both ends of the joint 63B in the radial direction of the double ring 44 are provided with openings (not shown) for a connector 65B for enabling connection with the adjacent segment 5B over the axial direction of the double ring 44. have. That is, the segment 5B is connected to the adjacent segment 5B by the connecting tool 65B via the joint 63B. The joint 63B is welded to each of the left and right ends of the plates 61B, 71B and the main girder 62B.

  One end of the coupling tool 65B is joined to the inner surface of the main girder 62B by welding, and the other end not welded to the main girder 62B is formed in a hook shape.

  The connection piece 53B is provided upright on the inner peripheral surface of each plate between the plates 61B and 71B. Specifically, three connecting pieces 53B are provided at equal intervals between both ends of the plates 61B and 71B, and both ends of the connecting piece 53B are welded to the inner peripheral surfaces of the plates 61B and 71B, respectively. Are joined. Thereby, the outer piece 51B and the inner piece 52B are connected to each other.

  Here, the segment 5B is partitioned into spaces by the adjacent connecting pieces 53B and the joints 63B. The through hole H of the main girder 72B is formed in the main girder 62B so as to communicate with each space one by one.

  When the segments 5B are connected to each other to assemble the double ring 44, the concrete is poured into the space through the through holes H.

<Others>
The present invention is not limited to the above embodiment. For example, the ring body is not limited to a circular shape in a plan view, and may be formed in an oval shape (an oval shape) in a plan view or a polygonal shape in a plan view.

  Further, the outer piece and the inner piece of the double ring are not limited to those formed by connecting a plurality of pieces, but may be formed integrally from the beginning.

  Further, the joint may be connected not only to the plate but also to a connecting member of the plate.

  The connecting piece 53 may be joined to the plates 61, 71 by welding or the like without passing through the connecting tools 66, 76. In this case, the space partitioned by each connecting piece 53 is a closed space.

  Further, of the connecting pieces 53, the connecting pieces 53 that connect other than the joints 63 and 73 do not need to be at the same height as the plates 61 and 71 and the joints 63 and 73, and connect the outer piece 51 and the inner piece 52. If it is large enough, its shape, height, etc. can be freely changed. For example, by setting the height of the connecting piece 53 for connecting parts other than the joints 63 and 73 to be lower than the plates 61 and 71, the space between the outer piece 51 and the inner piece 52 is not completely partitioned, and The concrete can be spread over the entire space between the outer piece 51 and the inner piece 52 by simply casting the concrete from one place at the time of installation, and the weight of the segment 5 can be reduced.

  Further, among the connection pieces 53, the connection piece 53 that connects other than the joints 63 and 73 is not limited to the plate-like member as described above, and may be a bar or the like such as a reinforcing bar. When such a configuration is adopted, the space between the outer piece 51 and the inner piece 52 is not completely partitioned, and the outer piece 51 and the inner Concrete can be spread over the entire space between the pieces 52, and the weight of the segment 5 can be reduced.

1 Submerged body 2 Base (concrete layer)
Reference Signs List 3 sinking anchor 4 ring body 41 blade ring 42 guide ring 43 work table ring 44 double ring 5 segment 51 outer piece 52 inner piece 53 connecting piece 61, 71 plate 62, 72 main beam 62b, 72b groove 63, 73 joint 65 , 75 Connector 66, 76 Connector 100 Submerged structure C Concrete H Through hole

Claims (18)

A segment constituting a submerged structure buried underground,
Forming an outer wall of the submerged structure, a plate forming a wall surface, and an outer piece having a main girder erected at an upper end and a lower end of the plate,
An inner piece having an inner wall of the sinking structure, a plate forming a wall surface, and a main girder erected at an upper end and a lower end of the plate,
A connecting piece that connects the outer piece and the inner piece,
Equipped with a,
The segment , wherein the outer piece, the inner piece, and the connecting piece are separate from each other .   The segment according to claim 1, wherein the main girder of the outer piece and the main girder of the inner piece are connected by the connecting piece.   The segment according to claim 1, wherein the connection piece is connected to the main girder with an interval between the plate and the plate.   The segment according to any one of claims 1 to 3, wherein the main girder or the plate is provided with a connecting tool for connecting the connecting pieces.   The segment according to any one of claims 1 to 4, wherein a groove is formed on an outer surface of at least one main girder.   The segment according to any one of claims 1 to 5, wherein the main girder of the outer piece and the main girder of the inner piece are formed integrally.   The segment according to claim 6, wherein a through hole communicating with a space between the outer piece and the inner piece is formed in the main girder. A segment constituting a submerged structure buried underground,
An outer piece forming an outer wall of the submerged structure;
An inner piece forming an inner wall of the submerged structure;
A connecting piece that connects the outer piece and the inner piece,
With
The outer piece, the inner piece and the connecting piece are separate bodies,
The outer piece and the inner piece each include a plate forming a wall surface, and a joint erected at a left end and a right end of the plate,
A segment wherein the joint of the outer piece and the joint of the inner piece are connected by the connecting piece.   The connecting piece that connects the joint of the outer piece and the joint of the inner piece partitions a space between the plate of the outer piece and the plate of the inner piece. segment.   The segment according to claim 8, wherein a connection tool for connecting the connection piece is provided on the joint or the plate.   The segment according to any one of claims 1 to 10, wherein a connecting tool for connecting the adjacent plates is provided at a left end and a right end of the plate. A method for constructing a submerged structure by assembling the segment according to any one of claims 1 to 11 to construct a submerged structure,
(A) assembling an annular ring body by connecting the segments;
(B) placing concrete in a space between the outer piece and the inner piece of the ring body assembled in the step (A);
(C) excavating the ground inside the ring body after the step (B) and applying force from above the ring body to sink the ring body into the ground;
(D) repeating the steps (A) to (C) to a predetermined depth;
A method for constructing a submerged structure, comprising: A method for constructing a submerged structure by assembling the segment according to any one of claims 1 to 11 to construct a submerged structure,
(A) assembling an annular ring body by connecting the segments;
(B) placing concrete in a space between the outer piece and the inner piece of the ring body assembled in the step (A);
After the step (B), a step (C) of connecting the segments to assemble an annular ring body on the upper end surface of the ring body assembled in the step (A);
After the step (C), the ground inside the ring body is excavated, and a force is applied from above the ring body assembled in the step (C) to remove the ring body assembled in the step (A). Submerging in the ground (D),
(E) casting concrete in a space between the outer piece and the inner piece of the ring body assembled in the step (C);
A step (F) of repeating the steps (A) to (E) to a predetermined depth,
A method for constructing a submerged structure, comprising: A method for constructing a submerged structure by assembling the segment according to any one of claims 1 to 11 to construct a submerged structure,
(A) assembling an annular ring body by connecting the segments;
A step (B) of connecting the segments at the upper end face of the ring body assembled in the step (A) to assemble an annular ring body and connecting the ring body assembled in the step (A);
After the step (B), a step (C) of placing concrete in a space between the outer piece and the inner piece of the ring body assembled in the step (A);
After the step (C), the ground inside the ring body is excavated, and a force is applied from above the ring body assembled in the step (B) to remove the ring body assembled in the step (A). Submerging in the ground (D),
(E) repeating the steps (B) to (D) to a predetermined depth;
A method for constructing a submerged structure, comprising:   The method according to any one of claims 12 to 14, wherein before the step (A), a work table ring serving as a work table when assembling the segments is assembled.   The method of constructing a submerged structure according to any one of claims 12 to 15, wherein a force is applied above the outer piece when the ring body is submerged in the ground. After sinking the ring body to a predetermined depth, a step of building a concrete layer on the bottom inside the ring body,
After the construction of the concrete layer, draining groundwater inside the ring body,
The method for constructing a submerged structure according to any one of claims 12 to 16, comprising:   The method according to any one of claims 12 to 17, further comprising a step of installing a sinking anchor that takes a reaction force when the ring body is sunk in the ground before the ring body is sunk. Construction method of submerged structure.

Images